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  <a name="EN-US_TOPIC_0000002200004841"></a><a name="EN-US_TOPIC_0000002200004841"></a>
  <h1 class="topictitle1">When ClickHouse and Redis Are Deployed Together, the Redis Node Is Offline or Backup or Restoration Fails Occasionally</h1>
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    <h4 class="sectiontitle">Symptom</h4>
    <p>When ClickHouse and Redis are deployed on the same MRS production node, the node is offline, or backup or restoration fails.</p>
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    <h4 class="sectiontitle">Possible Cause</h4>
    <p>When ClickHouse and Redis are deployed together, the Kerberos authentication principal configured for ClickHouse does not have permissions required for Redis backup and restoration.</p>
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    <h4 class="sectiontitle">Suggestion</h4>
    <ol>
     <li><span>Log in to the Redis node that is offline or where backup or restoration fails.</span></li>
     <li><span>Run the <strong>cd <em>/opt</em>/DataBackup/ProtectClient/ProtectClient-E/slog/Plugins/GeneralDBPlugin/</strong> command. (Replace <em><strong>/opt</strong></em> in the command with the actual installation directory of the client.) Go to the log file directory and check whether the <span class="uicontrol"><b>redis.log</b></span> log file contains the following error information:</span><p></p><p><strong>DB::Exception</strong> <em>XXX</em><strong>: Not enough privileges.</strong></p> <p><em>XXX</em> indicates the name of the Kerbors authentication principal of ClickHouse.</p>
      <ul>
       <li>If such error information is contained, grant permissions required for Redis backup and restoration to the Kerbors authentication principal of ClickHouse.</li>
       <li>If no such error information is displayed, collect logs and contact technical support engineers.</li>
      </ul> <p></p></li>
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     <strong>Parent topic:</strong> <a href="en-us_topic_0000002199970449.html">FAQs</a>
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